topic Unbalanced load in sharing using algorithm address-based L3_L4 LACP. in ExtremeSwitching (EXOS/Switch Engine)

Unbalanced load in sharing using algorithm address-based L3_L4 LACP.

Ambrose_Magee — Wed, 17 Mar 2021 03:18:24 GMT

Hello,

On an X690-48x-2q-4c with EXOS 22.5.1.7-patch1-2, I have configured these commands.

enable sharing 19 grouping 19-20 algorithm address-based L3_L4 lacp

enable sharing 29 grouping 29-30 algorithm address-based L3_L4 lacp

Although the source and destination of the packets are several IP addresses, there is little load balancing.

show ports utilization bandwidth

Port Link Link Rx Peak Rx Tx Peak Tx
State Speed % bandwidth % bandwidth % bandwidth % bandwidth
================================================================================

19 A 10000 37.45 70.98 3.91 5.27
20 A 10000 36.15 79.94 38.07 69.29

29 A 10000 45.78 90.02 2.25 3.80
30 A 10000 44.36 90.43 59.55 100.00

The Tx load is not balanced. May I ask for suggestions to fix this, please?

--- Ambrose.

Re: Unbalanced load in sharing using algorithm address-based L3_L4 LACP.

Miguel-Angel_RO — Wed, 17 Mar 2021 03:24:39 GMT

Ambrose,

There is no good or bad load-balancing algorithm.

There is just an algorithm matching better your specific traffic pattern.

With EXOS, the choices are L2, L3 or L3_L4.

With those figures, I would have a look on the config on the other side to ensure that the algorithm is matching the same settings on both sides.

If all is ok, you can give it a try on L2 then L3.

Mig

Re: Unbalanced load in sharing using algorithm address-based L3_L4 LACP.

Ambrose_Magee — Mon, 22 Mar 2021 17:41:02 GMT

Hello Miguel,

Thank you for your support. The root cause of the problem is traffic polarisation; there is a KB article on it.

Regards,

Ambrose.

Re: Unbalanced load in sharing using algorithm address-based L3_L4 LACP.

SamPirok — Tue, 23 Mar 2021 02:45:54 GMT

Hi @Ambrose Magee, could you share the link to the KB you’re referencing here? Just in case another community member comes across the same situation you are seeing.

Re: Unbalanced load in sharing using algorithm address-based L3_L4 LACP.

Ambrose_Magee — Wed, 24 Mar 2021 01:29:23 GMT

Hello @Sam Pirok,

https://extremeportal.force.com/ExtrArticleDetail?an=000062662&q=traffic%20polarization

--- Ambrose.

Re: Unbalanced load in sharing using algorithm address-based L3_L4 LACP.

Sunny — Wed, 21 Feb 2024 00:26:15 GMT

Hey,

How did you resolve it then ?